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The researchers looked at how long enveloped and nonenveloped viruses remained infectious on the surface of six types of wood: Scots pine, silver birch, gray alder, eucalyptus, pedunculate oak and Norway spruce.

Other trees tested, including European sycamores, European beech trees, and pedunculate oaks, burst about seven and a half days earlier in brighter conditions.

Erect, 1–2° high; stem and leaves more or less tomentose; leaflets 3, oval to oblong, obtuse or acutish; racemes short and shortly pedunculate.

The shape of the older parietal forms is usually globular or pedunculate, owing to the growth in all directions except at the place of attachment; the obstructing thrombi are elongated.

A flower having a stalk is called pedunculate or pedicellate; one having no stalk is sessile.